<template>
  <div class="createPost-container">
    <el-form ref="postForm" :model="postForm" :rules="rules" class="form-container">

      <sticky :z-index="10" :class-name="'sub-navbar '+postForm.status">
        <CommentDropdown v-model="postForm.comment_disabled" />
        <PlatformDropdown v-model="postForm.platforms" />
        <SourceUrlDropdown v-model="postForm.source_uri" />
        <el-button v-loading="loading" style="margin-left: 10px;" type="success" @click="submitForm">
          Publish
        </el-button>
        <el-button v-loading="loading" type="warning" @click="draftForm">
          Draft
        </el-button>
      </sticky>

      <div class="createPost-main-container">
        <el-row>
          <Warning />

          <el-col :span="24">
            <el-form-item style="margin-bottom: 40px;" prop="title">
              <MDinput v-model="postForm.title" :maxlength="100" name="name" required>
                Title
              </MDinput>
            </el-form-item>

            <div class="postInfo-container">
              <el-row>
                <el-col :span="8">
                  <el-form-item label-width="60px" label="Author:" class="postInfo-container-item">
                    <el-select v-model="postForm.author" :remote-method="getRemoteUserList" filterable default-first-option remote placeholder="Search user">
                      <el-option v-for="(item,index) in userListOptions" :key="item+index" :label="item" :value="item" />
                    </el-select>
                  </el-form-item>
                </el-col>

                <el-col :span="10">
                  <el-form-item label-width="120px" label="Publish Time:" class="postInfo-container-item">
                    <el-date-picker v-model="displayTime" type="datetime" format="yyyy-MM-dd HH:mm:ss" placeholder="Select date and time" />
                  </el-form-item>
                </el-col>

                <el-col :span="6">
                  <el-form-item label-width="90px" label="Importance:" class="postInfo-container-item">
                    <el-rate
                      v-model="postForm.importance"
                      :max="3"
                      :colors="['#99A9BF', '#F7BA2A', '#FF9900']"
                      :low-threshold="1"
                      :high-threshold="3"
                      style="display:inline-block"
                    />
                  </el-form-item>
                </el-col>
              </el-row>
            </div>
          </el-col>
        </el-row>

        <el-form-item style="margin-bottom: 40px;" label-width="70px" label="Summary:">
          <el-input v-model="postForm.content_short" :rows="1" type="textarea" class="article-textarea" autosize placeholder="Please enter the content" />
          <span v-show="contentShortLength" class="word-counter">{{ contentShortLength }}words</span>
        </el-form-item>

        <el-form-item prop="content" style="margin-bottom: 30px;">
          <Tinymce ref="editor" v-model="postForm.content" :height="400" />
        </el-form-item>

        <el-form-item prop="image_uri" style="margin-bottom: 30px;">
          <Upload v-model="postForm.image_uri" />
        </el-form-item>
      </div>
    </el-form>
  </div>
</template>

<script>
import { defineComponent } from 'vue';
import Tinymce from '@/components/Tinymce';
import Upload from '@/components/Upload/SingleImage3';
import MDinput from '@/components/MDinput';
import Sticky from '@/components/Sticky'; // 粘性header组件
import store from '@/store';
import { validURL } from '@/utils/validate';
import { fetchArticle } from '@/api/article';
import { searchUser } from '@/api/remote-search';
import Warning from './Warning';
import { CommentDropdown, PlatformDropdown, SourceUrlDropdown } from './Dropdown';

const defaultForm = {
  status: 'draft',
  title: '', // 文章题目
  content: '', // 文章内容
  content_short: '', // 文章摘要
  source_uri: '', // 文章外链
  image_uri: '', // 文章图片
  display_time: undefined, // 前台展示时间
  id: undefined,
  platforms: ['a-platform'],
  comment_disabled: false,
  importance: 0
};

export default defineComponent({
  name: 'ArticleDetail',
  components: { Tinymce, MDinput, Upload, Sticky, Warning, CommentDropdown, PlatformDropdown, SourceUrlDropdown },
  props: {
    isEdit: {
      type: Boolean,
      default: false
    }
  },
  data() {
    const validateRequire = (rule, value, callback) => {
      if (value === '') {
        ElMessage({
          message: rule.field + '为必传项',
          type: 'error'
        });
        callback(new Error(rule.field + '为必传项'));
      } else {
        callback();
      }
    };
    const validateSourceUri = (rule, value, callback) => {
      if (value) {
        if (validURL(value)) {
          callback();
        } else {
          ElMessage({
            message: '外链url填写不正确',
            type: 'error'
          });
          callback(new Error('外链url填写不正确'));
        }
      } else {
        callback();
      }
    };
    return {
      postForm: Object.assign({}, defaultForm),
      loading: false,
      userListOptions: [],
      rules: {
        image_uri: [{ validator: validateRequire }],
        title: [{ validator: validateRequire }],
        content: [{ validator: validateRequire }],
        source_uri: [{ validator: validateSourceUri, trigger: 'blur' }]
      },
      tempRoute: {}
    };
  },
  computed: {
    contentShortLength() {
      return this.postForm.content_short.length;
    },
    displayTime: {
      // set and get is useful when the data
      // returned by the back end api is different from the front end
      // back end return => "2013-06-25 06:59:25"
      // front end need timestamp => 1372114765000
      get() {
        return (+new Date(this.postForm.display_time));
      },
      set(val) {
        this.postForm.display_time = new Date(val);
      }
    }
  },
  created() {
    if (this.isEdit) {
      const id = this.$route.params && this.$route.params.id;
      this.fetchData(id);
    }

    // Why need to make a copy of this.$route here?
    // Because if you enter this page and quickly switch tag, may be in the execution of the setTagsViewTitle function, this.$route is no longer pointing to the current page
    // https://github.com/PanJiaChen/vue-element-admin/issues/1221
    this.tempRoute = Object.assign({}, this.$route);

    // https://kgithub.com/nuysoft/Mock/issues/301
    // 避免 _xhr.upload.addEventListener is not a function
    if (window._XMLHttpRequest) {
      var xhr = new window._XMLHttpRequest();
      window.XMLHttpRequest.prototype.upload = xhr.upload;
    }
  },
  methods: {
    fetchData(id) {
      fetchArticle(id).then(response => {
        this.postForm = response.data;

        // just for test
        this.postForm.title += `   Article Id:${this.postForm.id}`;
        this.postForm.content_short += `   Article Id:${this.postForm.id}`;

        // set tagsview title
        this.setTagsViewTitle();

        // set page title
        this.setPageTitle();
      }).catch(err => {
        console.log(err);
      });
    },
    setTagsViewTitle() {
      const title = 'Edit Article';
      const route = Object.assign({}, this.tempRoute, { title: `${title}-${this.postForm.id}` });
      store.tagsView().updateVisitedView(route);
    },
    setPageTitle() {
      const title = 'Edit Article';
      document.title = `${title} - ${this.postForm.id}`;
    },
    submitForm() {
      console.log(this.postForm);
      this.$refs.postForm.validate(valid => {
        if (valid) {
          this.loading = true;
          ElNotification({
            title: '成功',
            message: '发布文章成功',
            type: 'success',
            duration: 2000
          });
          this.postForm.status = 'published';
          this.loading = false;
        } else {
          console.log('error submit!!');
          return false;
        }
      });
    },
    draftForm() {
      if (this.postForm.content.length === 0 || this.postForm.title.length === 0) {
        ElMessage({
          message: '请填写必要的标题和内容',
          type: 'warning'
        });
        return;
      }
      ElMessage({
        message: '保存成功',
        type: 'success',
        showClose: true,
        duration: 1000
      });
      this.postForm.status = 'draft';
    },
    getRemoteUserList(query) {
      searchUser(query).then(response => {
        if (!response.data.items) return;
        this.userListOptions = response.data.items.map(v => v.name);
      });
    }
  }
});
</script>

<style lang="scss" scoped>
@import "@/styles/mixin.scss";

.createPost-container {
  position: relative;

  :deep(.sub-navbar) {
    display: flex;
    align-items: center;
    justify-content: right;
  }

  .createPost-main-container {
    padding: 40px 45px 20px 50px;

    .postInfo-container {
      position: relative;
      @include clearfix;
      margin-bottom: 10px;

      .postInfo-container-item {
        float: left;
      }
    }
  }

  .word-counter {
    width: 40px;
    position: absolute;
    right: 10px;
    top: 0px;
  }
}

.article-textarea {
  :deep(textarea) {
    padding-right: 40px;
    resize: none;
    border: none;
    border-radius: 0px;
    border-bottom: 1px solid #bfcbd9;
  }
}
</style>
